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HCF of 12, 18 and 30 is:
a) 6                        
b) 3        
c) 12                      
d) 180


If + 1 = 15, then x = ___________?
a) 5                        
b) 7                        
c) 13                      
d) 28


If 10 is subtracted from 5 times of a number, 35 is left the number is _____?
a) 9                        
b) 72                      
c) 8                        
d) 35


The oxidation state of oxygen in OF2 is:
a) +2      

b) – 2     
c) +4                      
d) – 1


The inaudible sound is:
a) 1500 Hz                           
b) 25 Hz
c) 20,000 Hz                        
d) 22,000 Hz